configure: Don't complain about the libcec version if it isn't instal…

…led.

Not sure I've got the header path correct there seems to be one too many libcec
directories in there but it does seem to match the existing check.

mythtv/configure

@@ -4119,7 +4119,12 @@ enabled libfftw3 && check_lib2 fftw3.h fftw_init_threads -lfftw3_threads -lfftw3
 # ass_flush_events was added in 0.9.10
 enabled libass && check_lib2 ass/ass.h ass_flush_events -lass || disable libass
 
-enabled libcec && check_cxx -I"$libcec_path" <<EOF || { echolog "libCEC support needs libcec >= 1" && disable libcec; }
+if ! check_header ${libcec_path}/libcec/cec.h; then
+    disable libcec;
+fi
+
+if enabled libcec ; then
+    check_cxx -I"$libcec_path" <<EOF || { echolog "libCEC support needs libcec >= 1" && disable libcec; }
 #include <libcec/cec.h>
 #include <iostream>
 using namespace std;
@@ -4131,6 +4136,7 @@ int main(void) {
     return (long) LoadLibCec;
 }
 EOF
+fi
 
 if enabled libxml2 ; then
    if pkg-config --exists libxml-2.0 ; then